Wrench



R. A. WILSON.'

WRENCH.

APPLICATION FILED JUNE 6.1921.

Patented J mie 6, 1 922.

2 SHEETSSHEET gwwnlo'q v 28. A. M'jan a. A. WILSON.

WRENCH. APPLICATH) HLED JUNE 6. 1921. I

Patented June 6; 1922.

2 SHEETS-SHEET 2.

ROBERT A. \VILSON, or DALLAS, rnxe TION, or DALLAS, Traces,

A CORPORATION OF S, ASSIGNOR TO G-UIBERSON CORPORA- DELAWARE.

wnnncn.

Specification of Application filed June 6,

To all whom it may concern:

Be it known that I, ROBERT A. Wilson, a citizen of the United States,residing at Dallas, in the county of Dallas and State of Texas, haveinvented certain new and useful Improvements in Wrenches, of which thefollowing is a specification.

This invention relates to new and useful improvements in wrenches.

The invention has particularly to do with a wrench which while havingmany uses is especially adapted for the screwing and unscrewing of welltubing tool joints, but which is not limited to such use.

An advantage of the invention lies in the provision of a cam dog havinga gripping face for engagement with a cylindrical object and actuated bymeans ofa lever which imparts to the dog a rotati've movement wherebysaid gripping face which is eccentric to its pivot point is caused togrip said object.

A further advantage is a simple positive wrench capable of undergoingheavy duty and withstanding severe strains without slipping, and at thesame time one which is easily and readily released.

A construction designed to carry out the invention will be hereinafterdescribed together with other features of the invention.

The invention will be more readily understood from a reading of thefollowing specification and by reference to the accompanying drawings,in which an example of the invention is shown and wherein:

Fig. 1 is a plan view of a wrench constructed in accordance with myinvention, a portion being illustrated in section to showing underlyingparts,

Fig. 2 is a longitudinal sectional view on the line 22 of Fig. 1,

Fig. 3 is a plan view of a modified form of wrench, a portion beingillustrated in section to show underlying parts and Fig. 4 is atransverse cross sectional View on the line ir-{t of Fig. 3. g

In the drawings the numeral 10 designates a rigid jaw which is providedwith a concaved seat or socket 11, which may have a contour to exactlyconform to that of the object received or it may be made on a greaterradius. At its outer ends the aw is illustrated and having faced cars 12which receive the ends of a latch link or keeper 13, which ends areperforated to receive bolts l-ilpassing through the ears 12. One ofthese Letters P t n Patented June 6, 1922.

1921. Serial No. 475,472.

bolts is removable so that the link may be swung outwardly when it isdesired to remove the jaw from the cylindrical object or to place itthereon. It is to be understood that the particular construction of thelatch link and the co-operating parts of the aw may be varied andvarious constructions may be used; however the parts should be of suchconfigurations as to snugly receive the cylindrical objects on which thewrench is to be used.

The jaw 10 is provided with a longitudinal cavity or chamber 15, whichis open at both ends as is shown in the drawings. A cam dog 16 ismounted in the chamber 011 a p-ivot bolt l7 suitably fastened in the jawand positioned at the center thereof. This dog has an arcuate face 18which is eccentric to the pivot bolt. The dog also has a rear face 19which is convex at the ends or sides of the dog. The gripping face 18lies substantially in front of the pivot bolt 17, while the rear face 19lies substantially in rear of said bolt. I 7

On each side of the center gripping face 18 is provided with serrationsor teeth 20,

the teeth on one side of the center being adapted to engage thecylindrical object A when the dog is rotated in one direction and theteeth on the opposite side of the center being adapted to engage theobject A when the dog is rotated in the opposite direction. The dog islocated so that when it is in a central position as is shown in Fig. 1,its

teeth will slide over the surface of the ob ject A, when the jaw isswung. It is obvious that the teeth being arranged on a face which iseccentric to the bolt 17 will bite into the object A, when the dog isrotated about its pivot point.

For rotating the dog and operating the wrench I provide a handle lever21 mounted on a pivot bolt 22 fastened in the jaw and passin through thechamber 15. The bolt 22 is alined with the bolt 17 on the longitudinalcenter axis of the jaw 10. The lever 21 is provided with a shoe or head23 which preferably has a transverse flat face 24 in contact with therear face 19 of the do 16. The face 24 is longer than the width of thedog so as to have an ample surface for engagement with the face 19.

It will be seen that by swinging the lever 21 on its bolt 22, the faceof its shoe will rideon the face 19 of the cam dog and cause said dog torotate about its pivot bolt 17 whereby the teeth 20 on one side will heforced into engagement with the object A, while the teeth on the otherside will be withdrawn therefrom. The more pressure that is exert ed onthe lever 21, the more firmly the teeth 20 will bite into the object A.It will be observed that only a slight movement of the lever 21 from itscentral position will be necessary to rock the dog and cause it to gripthe object A. By swinging the lever to the other side of thelongitudinal center the action of the dog is reversed and the teeth onthe opposite side caused to bite into the object A, whereby the object Amay be rotated in either direction or held against 1'0- tation in eitherdirect-ion.

In Figs. 4 and 5 I have shown a modified form in which a single actingcam dog 16 is mounted on a pivot bolt 17 which is offset laterally fromthe longitudinal center of the jaw. This dog has an arcuate grippingface 18 and teeth 20 thereon, said face being eccentric to the pivotbolt. The cam has a nose 25 which is engaged by the face 24 of the shoe28. When the lever 21 is swung the shoe rides on the nose 25 rotates thedog 16 whereby the teeth 20 bite into the object A. This particular formis not reversible and functions in one direction only. It will beobserved that in both forms of the invention pressure is exerted on thedog at a point offset laterally from the pivot points of both the dogand the lever and thus the gripping action is increased as the pressureis increased.

lVhen it is desired to release the wrench it is merely necessary toswing the lever 21 to its central position whereby the dog may berotated away from the cylindrical object by swinging the jaw 10 whichwill be effected when the lever isswung sufiiciently to permit the teeth20 to back out of engagement with the cylindrical object. The quickpositive gripping action together with a minimum slippage are thesalient points of this invention.

What I claim, is:

1. In a wrench, a jaw having a seat for receiving an article to begripped means for holding the jaw about the article, a cam dog pivotedin the jaw and having a gripping face for engaging the article, saidface being disposed eccentrically from the pivot point of the dog, and ahandle lever pivoted in the jaw and having a shoe provided with anactuating face engaging the dog at a point ofiset laterally from boththe pivot point of the dog and the lever.

2. In a wrench, a jaw having a seat for receiving an article to begripped, means for holdin the jaw about the article, a cam dog pivotedin the jaw and having a gripping face for engaging the article, saidface be ing disposed eccentrically from the pivot point of the dog, anda handle lever pivoted in the jaw and having a shoe provided with anactuating face engaging the dog at a I point offset laterally from boththe pivot point of the dog and the lever, said dog having teeth on itsgripping face.

3. In a wrench, a jaw having a work engaging seat, a latch link pivotedto the jaw, said jaw having a chamber extending rearwardly from itsseat, a cam dog pivoted in the chamber of? the jaw and provided with aneccentric gripping face adapted to be projected into the aw seat, ahandle lever, and a shoe on the lever pivoted in the jaw chamber andhaving a transverse actuating face engaging and exerting a pressure onthe dog at a point offset laterally from the pivot points of the dog andshoe, whereby the dog is rotated when the lever is swung.

In testimony whereof I affix my si nature.

ROBERT A. witson.

